Tension-plate-adjusting screw for shuttles



w. L. HALL 1,731,046

wnusxon PLATE ADJUSTING scrmw FOR szww'rnss Oct. 8, 1929.

Filed Jan. 10, 1928 mmwmmm m .QJ \Q INVENTOR.

Patented Oct. 8, 1929 UNITED STATES PATENT, OFFICE WASHINGTON L. HALL,OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO JAMES H. BILLINGTON COMPANY,OF PHILADELIPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIATENSION-PLATE-ADJUSTING SCREW FORSHUTTLES Application filed January 10,1928. Serial No. 245,652

My invention relates to a new and useful adjustable tension plate screwadapted for regulating the tension of the plate or other threadtcnsioning device in shuttles and the like, said adjustable screw beingof a novel construction, which prevents .its working loose or droppingout, thus insuring permanency and certainty of adjustment at all times.

It has been the practice heretofore to provide shuttles having threadtensioning means with an adjustment screw of conventional constructionwhich engages a threaded opening near the terminal basal portion of theshuttle. These adjustment screws of the conventional type eventuallywore loose through constant adjustn'ient and use and ultimately strippedthe wood or were liable to project beyond the bottom of the shuttle thuscutting and otherwise dan'iaging the fabric being woven. Furthermore, ascrew of this character frequently dropped out completely and was lost,thus suddenly and completely relieving all tension on the thread fedfrom the bobbin which resulted in an entanglement oi the thread or inloose, defective weave.

It is the object of my invention to overcome these disadvantages and toprovice an adjustment screw which will not be liable to wear loose anddrop out of place or project beyond the bottom of the shuttle, and onewhich at the same time is capable of being easily and accuratelyadjusted from the o1:- terior of the shuttle to regulate the threadtensioning means or tension plate to any de sired extent.

To the above ends, my invention consists in providing a novel adjustmentscrew of the character described which is preferably made of metal, saidscrew being provided with an upper annular flange adapted to seat on aninner annular seat or counterbore in the shuttle body, and beingprovided with a bottom slot or groove adapted to receive the end of ascrew driver or the like inserted through the lower end of an aligningopening in the bottom of said shuttle body, whereby said screw may berevolved to regulate the position of the tension plate.

My invention further consists in the various novel features ofconstruction and advantage hereinafter described and claimed.

For the purpose of illustrating my invention I have shown in theaccompanying sketches a form thereof which is at present preferred by mesince it will give in practice, satisfactory and reliable resultsalthough it is to be understood that the various instrumentalities ofwhich my invention consists can be variously arranged and organized andthat my invention is not limited to the precise arrangement andorganization of these instrumentalities as herein shown and described. I

In the accompanying drawings,

Fig. 1 represents a top plan View of a shuttle embodying my invention.

Fig. 2 represents a section, on an enlarged scale, taken on line 2-2 ofFig. 1.

Fig. 3 represents a transverse section on line 3-3 of Fig. 2. c

Fig. t represents a perspective view of my novel tension plateadjustment screw, shown in detached position.

Fig. 5 represents section on line 55 of Fig. 4:.

Referring to the drawings, in which like reference characters indicatelike parts, 1 designates a shuttle of any conventional constructioncomprising the body 2 in which is positioned the bobbin 8 carrying thethread 41-. 5 designates a guard member pivotally secured at its rearend to the body 2 and having its front end detachably engaged by the1novable hook 6. The thread l passes through the guide 7 and between thetension plate 8 and the stationary roller 11 and out through the eyelet12, the tension plate 8 being pivoted at 9 and constantly urged upwardlyagainst the roller llbythespringlO. Ascrew13havingthelower threadedportion 1 1 and the upper annular flange 15 and provided with the lowertransverse slot 16 and the upper counter-bore 17 below which is thechamber 21, is positioned in the internally threaded opening 18 in thebottom of the shuttle 1. The spring 10 has its lower end seated in therecess 17 in the top of the screw 13 and its upper end bears against thetension plate 8 as will be understood from Figs. 2 and 3.

When it is desired to adjust the tension oi the plate 8, a screw driveror similar imple ment is inserted through the lower end of the opening18 to engage the slot 16, whereby the screw 18 may be revolved in eitherdirection to increase or decrease the tension on the ten sion plate asmay be desired.

The adjustment screw 13 is thus entirely enclosed and completelyprotected from outside influences and its tendency to work loose isgreatly reduced. Furthermore, by the engagement of the flange 15 withthe seat 20, the screw 13 is positively prevented from dropping out ofplace and getting lost and from projecting beyond the bottom of theshuttle to cut or otherwise damage the warp of the tabric, in the eventthat the threads on said screw 13 or said opening 18 should wear out andbecome ineii'ective. Due to the fact that it is impossible to displacethe screw 13 from the opening 18, a certain minimum pressure is alwaysexerted on the finger or tension plate 8 and the thread a is at alltimes drawn surliciently taut to prevent the entanglement or looseweaving thereof.

1 am aware that the invention may be embodied in other specific formswithout departing from the spirit or essential attributes thereof, and Itherefore desire the present embodimentto be considered in all respectsas illustrative and not restrictive, reference being had to the appendedclaims rather than to the foregoing description to indicate the scope ofthe invention.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. In a device of the character stated, the combination in a shuttle ofa tension plate, a spring of small height bearing against the bottomthereof, a shallow threaded opening directly in said shuttle aligningwith said spring, a recessed seat in the top of said open-v ing, atleast a portion of said spring being accommodated in said seat, anadjustable tension screw of small height positioned in said opening andprovided with an upper annular flange which flange is accommodated insaid recessed seat, said screw having a lower slot therein for enablingsaid screw to be adjusted from the exterior of said shuttle the combinedheight of said spring and screw approximating the height of said shallowopen- 111g.

2. In adevice of the character stated, the combination in a shuttle of atension plate, a spring of small height bearing against the bottomthereof, a' transverse roller in proximity to and above said tensionplate, there being a. threaded opening of small height directly in theshuttle aligning with said spring, a counterbore in the upper portion ofsaid opening at least a part of said spring being accommodated in saidcounterbore, an adj ustable tension screw of small height adapted tomemes engage said threaded opening and provided with an upper annularflange adapted to engage said counterbore, and a lower slot in saidscrew for enabling said screw to be adjusted from the exterior of saidshuttle, the upper portion oi said screw being provided with a recessedcounterbore adapted to receive the lower end of said spring the combinedheight 01": said spring and screw approximating the height of saidshallow opening.

l VASHINGTON L. HALL.

